I will fix net, csharp, apis and microservices

About me

- 20+ years of experience, highload and fintech projects

- Focus: resilient APIs, clean architecture, measurable performance

What I fix

- ASP.NET Core runtime issues: crashes, hangs, memory leaks

- EF Core: N+1, locks, slow migrations, incorrect schemas

- API: broken routes/contracts, CORS, Swagger/OpenAPI mismatches

- Authentication/Authorization: JWT/Identity, refresh tokens, roles/policies

- Performance: high latency/timeouts, degraded RPS/TP95/TP99

Related

- SQL Server, PostgreSQL, MySQL, SQLite indexes, queries, migrations; MongoDB, Redis cache, document usecases

Process

1) Diagnostics (logs/metrics) action plan

2) Fixes in a feature branch, tests, PR

3) Demo and adjustments, release

4) Handover: instructions and recommendations

Tech stack

- .NET 6/7/8, C#, ASP.NET Core (Web API, Minimal API)

- EF Core/Dapper, AutoMapper, FluentValidation

- Docker, Git, CI/CD (GitHub/GitLab/Azure DevOps)

Deliverables

- Productionready fixes, updated Swagger/OpenAPI, Postman, SQL scripts

- Short before/after report with key metrics